External frame for backpack



FIG. 1 is a front elevational view of my design for an external frame for a backpack;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof; the opposite side view being a mirror image thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear perspective view thereof; and,

FIG. 7 is a front perspective view thereof. 

The ornamental design for a external frame for backpack, is shown and described. 